Puerto Rico rental car or nah?

[TravelNotes]

Do we need a rental car for San Juan Puerto Rico?

We are staying in an Airbnb in the Ocean Park/Condado area of San Juan for 5 days. We want to go to Old San Juan a few times and maybe do one day trip to El Yunque rainforest. Should we rent a car for the whole week or just rely on Ubers and book a tour for the rainforest? I’ve heard parking is a nightmare.